Use of non-adhesive materials as stencil copy, and the method of retaining same to the screen, in screen process printing



March 22, 1960 J. Q. LARSON 2,929,315

USE OF NON-ADHESIVE MATERIALS AS STENCIL co y, AND

THE METHOD OF RETAINING SAME TO THE SCREEN, IN SCREEN PROCESS PRINTINGFil'ed Dec. 12, 1956 INVENTOR JACK LAasoN United States Patent USE OFNON-ADHESIVE MATERIALS AS STENCIL COPY, AND THE METHOD OF RETAINING SAMET6 THE SCREEN, IN SCREEN PROCESS PRINTING Jack Q. Larson, Mason City,Iowa Application December 12, 1956, Serial No. 627,957

1 Claim. (Cl. 101-129) The present invention relates to screenprocessing with the use of non-adhesive stencil materials and has for anobject, the improvements in the method of separating an imprinted sheetor material from the screen mesh, without the additional use ofadhesives, to hold stencil copy to screen.

Heretofore screen processing has been limited with the use of thinmaterials as stencil copy, because if an adhesive was not used to holdthin materials to screen before screening of coloring material, upon therelease of the imprinted copy or material, from screen, some or all ofthe thin materials may separate from the screen and stay on theimprinted copy or material, thus resulting in loss of copy from screen,loss of time etc.

The principle object of my invention is the improved method ofseparating flexible imprinted material from the screen mesh, without thelosing or removal of stencil copy from screen, by the application ofpressure across screen by means of a suitable thin device, such as astifi card, roller, bar, squeegee or the like, while at the same timegrasping the imprinted material and then simultaneously peeling theimprinted material away from stencil copy and screen, while moving theline of application of pressure. v

In use with my method, either the card or screen frame may move, duringline of application of pressure or one may move separately orindependently, while the other is in a stationary position. The card asemployed, may consist of various materials, in applying or with the useof applying pressure and may vary in sizes, suitable to accommodate thestencil copy and screen employed.

With the foregoing object and improvement in view, the invention will bemore fully described and pointed out in the following descriptions andclaim.

Figure 1 is a prepared screen in a position showing the bottom view.

2,929,315. Patented Mar. 22, 1960 Figure 2 is a fragment-a1cross-sectional side view of a screen as in Figure 1.

Figure 3 is a cross-sectional view of screen as in Figure 2 showingimpressing of screen, during pressure method.

Figure 4 is an imprinted copy, showing that intricate as well as largestencil copy is now possible, in screena ing without adhering stencilcopy to screen with adhesives,

glues or the like.

Referring more particularly to the drawings; after the screen 15 hasbeen raised, following the imprinting of coloring material 14 on animprinted material 11, by pressure being applied across imprintedmaterial 11, against the screen mesh 12, with the use of a card 10, thengrasping the imprinted material 11 in the general area 114 whilesimultaneously peeling the imprinted material 11 away and moving theline of application of pressure, the various stencil copy 13 is leftintact on screen mesh 12.

By pressure applied across imprinted material 11 that has been screenedcoloring material 14 upon, pressure exists on the stencil copy 13,against screen mesh 12. By grasping the imprinted material 11 in thegeneral area, best shown as 11a in Figs. 1 and 2 and then simultaneouslypeeling the imprinted material 11 away while moving the lineofapplication of pressure, the adhesive action of the coloring material 14on the imprinted material 11 is broken from the edges of the stencilcopy 13,

thereby leaving stencil copy 13 intact to screen mesh 12 by the actionof coloring material 14 remaining in mesh.

Variations in my invention of the improvements in the method ofseparating various flexible materials from the screen mesh are assumedand expected within the scope of the enclosed invention by the followingclaim.

What I claim is:

The method of separating flexible imprinted material from a stencilscreen having stencil material retained thereon by the coloring materialused for printing which comprises applying pressure across the screennear one end thereof, grasping the margin of the imprinted materialadjacent the said end of the screen, and then simultaneously peeling theimprinted material away from the screen while moving the line ofapplication of the pressure along the screen to the other end thereof,whereby the References Cited in the file of this patent UNITED STATESPATENTS 1,478,745 Kem Dec. 25, 1923

